Just an update for reading this. Hub firmware update 1.1.5 and the last couple versions have added support for many of these devices, including the motion sensor (generic driver), button (new Samsung ZigBee Button driver), and now the contact sensor:
Continuing the discussion from Hub Update 1.1.5:
However, it appears the generic contact sensor driver does not support the acceleration features of the 2018 ST Multi sensor. The device itself does appear to support them since at one point I was able to get things to show up in the logs when the sensor was shaken (unless that was just coincidental) and I was toying with porting the ST driver (can't figure out how to port some of it, though--are things like zigbee.ATTRIBUTE_IAS_ZONE_STATUS constants declared in ST but not Hubitat?).
BTW, I have no plans to buy the leak sensor or the outlet, so I won't be able to help wit those--these are the only devices I really cared about from the new lineup. 
